بررسی شیوع خال های ملانوسیتیک مادرزادی در کلاس های اول و پنجم دبستان های تهران در سال 1375

Congenital melanocytic nevi (CMN) are pigmented lesion which are present at birth or arise shortly there after. Some of these nevi have malignant potential, it's apparent is anxious for child and his parents. Little information is available on the prevalence of these nevi. Our purpose was to determine the frequency of CMN in primary school students in Tehran. From the students, 1902 persons were examined and 6.7%±2.2×10^-3 percent had CMN. The size of nevi was small (diameter 20 cm) in 0.1 percent of cases. The location of nevi in order to prevalence was trunk, lower extremities, upper extremities and head and neck. There was not any relation between age, sex, race, hair color, eye color and prevalence of CMN. The prevalence of CMN was higher in our study than other studies perhaps reflecting different race or definition of CMN or unknown factors.